Compensation control device for three-phase voltage unbalance

Abstract

The present invention discloses a compensation control device for three-phase voltage imbalance, which relates to the technical field of three-phase voltage compensation control, and includes a voltage measurement module, a control algorithm module and a compensation output module, wherein the collector self-checking unit is respectively connected to an output unit, an error compensation unit and an alarm unit. The compensation control device for three-phase voltage imbalance uses a timing to perform self-check on a voltage collector to determine whether an error is generated in the value collected by the voltage collector, and when an error with a fixed value is detected, the voltage value after correction can be automatically corrected and the corrected voltage value can be output to participate in the subsequent calculation of compensation parameters, thereby ensuring the accuracy of the voltage value result collected by the voltage collection unit each time, and when the error fluctuates, an alarm is issued, and the voltage value collected by the voltage collection unit does not participate in the subsequent calculation of compensation parameters, thereby preventing the final voltage three-phase average from being misaligned.

Description

Technical Field

[0001] The invention relates to the technical field of three-phase voltage compensation control, and in particular to a compensation control device for three-phase voltage imbalance. Background Art

[0002] The three-phase voltage unbalance compensation control device is a device used to adjust and compensate for the three-phase voltage unbalance. It changes the proportion or phase of the phase voltage by analyzing the three-phase average value, minimum value and maximum value of the voltage to achieve three-phase voltage averaging.

[0003] The existing three-phase voltage imbalance compensation control device needs to collect the actual value of the three-phase voltage through a collector when realizing the three-phase voltage averaging. However, after working for a long time or due to other environmental factors or improper human operation, the actual voltage value collected by the collector will deviate, resulting in the final three-phase voltage averaging being inaccurate.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a compensation control device for three-phase voltage imbalance is proposed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a compensation control device for three-phase voltage imbalance, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a compensation control device for three-phase voltage imbalance, comprising a voltage measurement module, a control algorithm module and a compensation output module, wherein the voltage measurement module is connected to the control algorithm module, and the control algorithm module is connected to the compensation output module, the voltage measurement module comprises a voltage acquisition unit, a periodic self-test setting unit, a voltage simulation unit, a voltage adjustment unit, a feedback unit, a collector self-test unit, an output unit, an error compensation unit and an alarm unit, the voltage acquisition unit is respectively connected to the periodic self-test setting unit and the voltage simulation unit, and the voltage simulation unit is connected to the voltage adjustment unit, the voltage adjustment unit and the voltage acquisition unit are connected to the feedback unit, and the feedback unit is connected to the collector self-test unit, and the collector self-test unit is respectively connected to the output unit, the error compensation unit and the alarm unit.

[0007] Furthermore, the voltage acquisition unit collects the actual value of the three-phase voltage through a voltage collector, the periodic self-test setting unit is used to set the self-test time interval of the voltage collector, the voltage simulation unit is connected to the voltage acquisition unit, and the voltage simulation unit is used to simulate and generate a voltage of a specified value.

[0008] Furthermore, the voltage adjustment unit is used to adjust the voltage value generated by the voltage simulation unit, and the collector self-test unit determines whether the voltage value generated by the voltage adjustment unit and the voltage value collected and fed back by the voltage collection unit are consistent. If they are consistent, it means that the voltage collection unit has detected accurately, and if they are inconsistent, it means that the voltage collection unit has an error.

[0009] Furthermore, the output unit is used to output the actual value of the three-phase voltage collected by the voltage collection unit when it is determined that the voltage collection unit has detected accurately; the error compensation unit is used to correct and output the actual value collected by the voltage collection unit after subtracting the fixed value error when it is determined that the voltage collection unit has collected errors and the error value is a fixed value; the alarm unit is used to issue an alarm to the system background when it is determined that the voltage collection unit has collected errors and the error value fluctuates.

[0010] Furthermore, the control algorithm module includes a three-phase average value calculation unit, a three-phase maximum value calculation unit, a three-phase minimum value calculation unit and a compensation parameter calculation unit, the three-phase average value calculation unit is connected to the three-phase maximum value calculation unit, and the three-phase maximum value calculation unit is connected to the three-phase minimum value calculation unit, and the three-phase minimum value calculation unit is connected to the compensation parameter calculation unit.

[0011] Furthermore, the three-phase average value calculation unit is used to calculate the three-phase average value of the voltage, and the specific formula is as follows:

[0012]

[0013] in, is the value output by the error compensation unit and the output unit, is the three-phase average value of voltage.

[0014] Furthermore, the three-phase maximum value calculation unit is used to calculate the maximum value of the voltage, and the specific formula is as follows:

[0015]

[0016] in, is the maximum value of the three-phase voltage of the voltage acquisition unit;

[0017] The three-phase minimum value calculation unit is used to calculate the minimum value of the voltage. The specific formula is as follows:

[0018]

[0019] in, It is the minimum value of the three-phase voltage of the voltage acquisition unit.

[0020] Furthermore, the compensation parameter calculation unit is used to calculate the compensation ratio and the compensation phase, and the specific formula is as follows:

[0021] Compensation ratio

[0022] Compensation Phase

[0023] in, Represents the inverse tangent function used to calculate the angle value, i.e. the compensation phase .

[0024] Furthermore, the voltage measurement module also includes an error recording unit, a collector information recording unit and an after-sales contact unit, the error compensation unit and the alarm unit are connected to the error recording unit, and the error recording unit is connected to the collector information recording unit, and the collector information recording unit is connected to the after-sales contact unit.

[0025] Furthermore, the error recording unit is used to record the time and error information when an error occurs in the actual value of the three-phase voltage collected by the voltage collection unit; the collector information recording unit is used to store information on the working time, service life, warranty period, and after-sales contact information of the voltage collection unit; and the after-sales contact unit is used to contact after-sales maintenance personnel and send the error information.

[0026] The present invention provides a compensation control device for three-phase voltage imbalance, which has the following beneficial effects:

[0027] The three-phase voltage imbalance compensation control device uses a timed self-check on a voltage collector to determine whether an error occurs in the value collected by the voltage collector, and when an error with a fixed value is detected, the device can automatically correct it and output the corrected voltage value so that it can participate in the subsequent calculation of compensation parameters, thereby ensuring the accuracy of the voltage value result collected by the voltage collection unit each time, and when the error fluctuates, an alarm is issued and the voltage value collected by the voltage collection unit does not participate in the subsequent calculation of compensation parameters, thereby preventing the final voltage three-phase average from being misaligned.

[0028] The three-phase voltage imbalance compensation control device has an error recording unit that records information such as the time and error condition when an error occurs in the actual value of the three-phase voltage collected by the voltage acquisition unit, and based on the information of the voltage acquisition unit recorded in the collector information recording unit, the after-sales maintenance personnel are contacted by the after-sales contact unit within the warranty period and the error condition is sent. Therefore, after an error occurs in the voltage acquisition unit, the merchant's after-sales or maintenance personnel can be contacted by the after-sales or maintenance personnel, and the detailed error condition can be sent to the personnel in time, so that the personnel can understand the situation as soon as possible and perform maintenance and calibration in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the operation flow of the voltage simulation unit of the compensation control device for three-phase voltage imbalance of the present invention;

[0030] Figure 2 It is a schematic diagram of the overall operation flow of the compensation control device for three-phase voltage imbalance of the present invention;

[0031] Figure 3 It is a schematic diagram of the internal operation flow of the control algorithm module of the compensation control device for three-phase voltage imbalance of the present invention;

[0032] Figure 4 The figure is a schematic diagram of the operation flow of the error recording unit of the compensation control device for three-phase voltage imbalance of the present invention.

[0033] In the figure: 1. Voltage measurement module; 101. Voltage acquisition unit; 102. Periodic self-test setting unit; 103. Voltage simulation unit; 104. Voltage adjustment unit; 105. Feedback unit; 106. Collector self-test unit; 107. Output unit; 108. Error compensation unit; 109. Alarm unit; 110. Error recording unit; 111. Collector information recording unit; 112. After-sales contact unit; 2. Control algorithm module; 201. Three-phase average value calculation unit; 202. Three-phase maximum value calculation unit; 203. Three-phase minimum value calculation unit; 204. Compensation parameter calculation unit; 3. Compensation output module. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] like Figure 1-Figure 4As shown, the present invention provides a technical solution: a compensation control device for three-phase voltage imbalance, comprising a voltage measurement module 1, a control algorithm module 2 and a compensation output module 3, wherein the voltage measurement module 1 is connected to the control algorithm module 2, and the control algorithm module 2 is connected to the compensation output module 3, the voltage measurement module 1 comprises a voltage acquisition unit 101, a periodic self-check setting unit 102, a voltage simulation unit 103, a voltage adjustment unit 104, a feedback unit 105, a collector self-check unit 106, an output unit 107, an error compensation unit 108 and an alarm unit 109, The voltage acquisition unit 101 is respectively connected to the periodic self-check setting unit 102 and the voltage simulation unit 103, and the voltage simulation unit 103 is connected to the voltage adjustment unit 104, the voltage adjustment unit 104 and the voltage acquisition unit 101 are connected to the feedback unit 105, and the feedback unit 105 is connected to the collector self-check unit 106, and the collector self-check unit 106 is respectively connected to the output unit 107, the error compensation unit 108, and the alarm unit 109. The voltage acquisition unit 101 collects the actual value of the three-phase voltage through the voltage collector, and the periodic self-check setting unit 102 is used to set the self-check time interval of the voltage collector, the voltage simulation unit 103 is connected to the voltage collection unit 101, and the voltage simulation unit 103 is used to simulate and generate a voltage of a specified value, the voltage adjustment unit 104 is used to adjust the voltage value generated by the voltage simulation unit 103, the collector self-check unit 106 judges whether the voltage value generated by the voltage adjustment unit 104 and the voltage value collected and fed back by the voltage collection unit 101 are consistent, if consistent, it means that the voltage collection unit 101 detects accurately, if inconsistent, it means that the voltage collection unit 101 has an error, the output unit 107 is used to output the actual value of the three-phase voltage collected by the voltage collection unit 101 when it is judged that the voltage collection unit 101 has an error, and the error value is a fixed value, the actual value collected by the voltage collection unit 101 is subtracted from the fixed value error, and then corrected and output, the alarm unit 109 is used to send an alarm to the system background when it is judged that the voltage collection unit 101 has an error and the error value has fluctuation;

[0036] The specific operation is as follows: The voltage acquisition unit 101 collects the actual values ​​of the three-phase voltage through the voltage collector, which are named After the self-test time interval of the voltage acquisition unit 101 is set by the periodic self-test setting unit 102, whenever the self-test time is reached, the voltage simulation unit 103 simulates and generates a voltage of a specified value, and the voltage acquisition unit 101 acquires the voltage value of the circuit simulated by the voltage simulation unit 103, and feeds it back to the collector self-test unit 106 through the feedback unit 105, and the voltage adjustment unit 104 adjusts the voltage value generated by the voltage simulation unit 103, so that the voltage acquisition unit 101 performs multiple acquisitions, and the voltage adjustment unit 104 also feeds back the adjusted voltage value each time to the collector self-test unit 106, and the collector self-test unit 106 generates a voltage value based on the voltage value fed back by the voltage adjustment unit 104 and the voltage collected and fed back by the voltage acquisition unit 101. The numerical values ​​are judged to be consistent. If they are consistent, it means that the voltage acquisition unit 101 detects accurately. If they are inconsistent, it means that the voltage acquisition unit 101 generates an error. The output unit 107 outputs the actual value of the three-phase voltage collected by the voltage acquisition unit 101 when it is judged that the voltage acquisition unit 101 detects accurately. The error compensation unit 108 corrects and outputs the actual value collected by the voltage acquisition unit 101 after subtracting the fixed value error when it is judged that the voltage acquisition unit 101 collects with an error and the error value is a fixed value. The alarm unit 109 sends an alarm to the system background when it is judged that the voltage acquisition unit 101 collects with an error and the error value fluctuates. The voltage numerical parameters when it is only judged that the voltage acquisition unit 101 collects with an error and the error value fluctuates do not participate in the subsequent three-phase compensation control steps.

[0037] Based on the above description, the present invention utilizes timed self-checking of the voltage collector to determine whether the value collected by the voltage collector generates an error, and when an error with a fixed value is detected, it can be corrected automatically and the corrected voltage value can be output to allow it to participate in the subsequent calculation of compensation parameters, thereby ensuring the accuracy of the voltage value result collected by the voltage collection unit 101 each time, and when the error fluctuates, an alarm is issued and the voltage value collected by the voltage collection unit 101 does not participate in the subsequent calculation of compensation parameters, thereby preventing the final voltage three-phase average from being misaligned.

[0038] like Figure 1-Figure 4 As shown, the control algorithm module 2 includes a three-phase average value calculation unit 201, a three-phase maximum value calculation unit 202, a three-phase minimum value calculation unit 203 and a compensation parameter calculation unit 204. The three-phase average value calculation unit 201 is connected to the three-phase maximum value calculation unit 202, and the three-phase maximum value calculation unit 202 is connected to the three-phase minimum value calculation unit 203, and the three-phase minimum value calculation unit 203 is connected to the compensation parameter calculation unit 204. The three-phase average value calculation unit 201 is used to calculate the three-phase average value of the voltage. The specific formula is as follows:

[0039]

[0040] in, is the value output by the error compensation unit 108 and the output unit 107, is the three-phase average value of the voltage, and the three-phase maximum value calculation unit 202 is used to calculate the maximum value of the voltage. The specific formula is as follows:

[0041]

[0042] in, is the maximum value of the three-phase voltage of the voltage acquisition unit 101;

[0043] The three-phase minimum value calculation unit 203 is used to calculate the minimum value of the voltage. The specific formula is as follows:

[0044]

[0045] in, is the minimum value of the three-phase voltage of the voltage acquisition unit 101. The compensation parameter calculation unit 204 is used to calculate the compensation ratio and the compensation phase. The specific formula is as follows:

[0046] Compensation ratio

[0047] Compensation Phase

[0048] in, Represents the inverse tangent function used to calculate the angle value, i.e. the compensation phase ;

[0049] The specific operation is as follows: the actual value of the three-phase voltage collected by the voltage collection unit 101 is self-checked and judged, and then the value output by the error compensation unit 108 and the output unit 107 is The three-phase average value of the voltage, the maximum value of the three-phase voltage, and the minimum value of the three-phase voltage are calculated in sequence. The formula described above is brought into the embodiment, which is as follows:

[0050] When measuring voltage If it is 220V, For 240V, The voltage is 200V. Substitute it into the three-phase average voltage calculation formula, and the result is as follows:

[0051]

[0052] Then calculate the maximum value of the three-phase voltage and the minimum value of the three-phase voltage, as follows:

[0053] Maximum value of three-phase voltage

[0054] Minimum three-phase voltage

[0055] Finally, the compensation ratio and compensation phase are calculated as follows:

[0056]

[0057]

[0058] Finally, the compensation output module 3 calculates the compensation phase Change the ratio or phase of the phase voltage to achieve three-phase voltage averaging.

[0059] like Figure 1-Figure 4 As shown, the voltage measurement module 1 also includes an error recording unit 110, a collector information recording unit 111 and an after-sales contact unit 112. The error compensation unit 108 and the alarm unit 109 are connected to the error recording unit 110, and the error recording unit 110 is connected to the collector information recording unit 111. The collector information recording unit 111 is connected to the after-sales contact unit 112. The error recording unit 110 is used to record the time and error information when an error occurs in the actual value of the three-phase voltage collected by the voltage collection unit 101. The collector information recording unit 111 is used to store the working time, service life, warranty period, and after-sales contact information of the voltage collection unit 101. The after-sales contact unit 112 is used to contact after-sales maintenance personnel and send the error situation;

[0060] The specific operation is as follows: the voltage acquisition unit 101 enters the working state after installation, and the collector information recording unit 111 records the working time, service life, warranty period, after-sales contact information and other information of the voltage acquisition unit 101, and can also enter the contact information of the maintenance and repair personnel responsible for the voltage acquisition unit 101. When the error compensation unit 108 and the alarm unit 109 output information, it means that the voltage acquisition unit 101 must have an error. At this time, the error recording unit 110 records the time, error situation and other information when the actual value of the three-phase voltage collected by the voltage acquisition unit 101 has an error, and based on the information of the voltage acquisition unit 101 recorded in the collector information recording unit 111, the after-sales maintenance personnel are contacted by the after-sales contact unit 112 within the warranty period and the error situation is sent. Therefore, after an error occurs in the voltage acquisition unit 101, the merchant's after-sales or maintenance personnel can be contacted by themselves, and the detailed error situation can be sent to the personnel in time, so that the personnel can understand the situation as soon as possible and perform repairs and calibration in time.

[0061] In summary, when the three-phase voltage unbalanced compensation control device is used, first, the actual value of the three-phase voltage collected by the voltage collection unit 101 is self-checked and judged, and then the value output by the error compensation unit 108 and the output unit 107 is obtained. The three-phase average value of the voltage, the maximum value of the three-phase voltage, and the minimum value of the three-phase voltage are calculated in sequence. The formula described above is brought into the embodiment, which is as follows:

[0062] When measuring voltage If it is 220V, For 240V, The voltage is 200V. Substitute it into the three-phase average voltage calculation formula, and the result is as follows:

[0063]

[0064] Then calculate the maximum value of the three-phase voltage and the minimum value of the three-phase voltage, as follows:

[0065] Maximum value of three-phase voltage

[0066] Minimum three-phase voltage

[0067] Finally, the compensation ratio and compensation phase are calculated as follows:

[0068]

[0069]

[0070] Finally, the compensation output module 3 calculates the compensation phase Changing the ratio or phase of the phase voltage to achieve three-phase voltage averaging;

[0071] After the self-test time interval of the voltage acquisition unit 101 is set by the periodic self-test setting unit 102, whenever the self-test time is reached, the voltage simulation unit 103 simulates and generates a voltage of a specified value, and the voltage acquisition unit 101 acquires the voltage value of the circuit simulated by the voltage simulation unit 103, and feeds it back to the collector self-test unit 106 through the feedback unit 105, and the voltage adjustment unit 104 adjusts the voltage value generated by the voltage simulation unit 103, so that the voltage acquisition unit 101 performs multiple acquisitions, and the voltage adjustment unit 104 also feeds back the adjusted voltage value each time to the collector self-test unit 106, and the collector self-test unit 106 generates a voltage value based on the voltage value fed back by the voltage adjustment unit 104 and the voltage collected and fed back by the voltage acquisition unit 101. The numerical values ​​are judged to be consistent. If they are consistent, it means that the voltage acquisition unit 101 detects accurately. If they are inconsistent, it means that the voltage acquisition unit 101 generates an error. The output unit 107 outputs the actual value of the three-phase voltage collected by the voltage acquisition unit 101 when it is judged that the voltage acquisition unit 101 detects accurately. The error compensation unit 108 corrects and outputs the actual value collected by the voltage acquisition unit 101 after subtracting the fixed value error when it is judged that the voltage acquisition unit 101 collects with an error and the error value is a fixed value. The alarm unit 109 sends an alarm to the system background when it is judged that the voltage acquisition unit 101 collects with an error and the error value fluctuates. The voltage numerical parameters when it is only judged that the voltage acquisition unit 101 collects with an error and the error value fluctuates do not participate in the subsequent three-phase compensation control steps.

[0072] The voltage acquisition unit 101 enters the working state after installation, and the collector information recording unit 111 records the working time, service life, warranty period, after-sales contact information and other information of the voltage acquisition unit 101. The contact information of the maintenance and repair personnel responsible for the voltage acquisition unit 101 can also be entered. When the error compensation unit 108 and the alarm unit 109 output information, it means that an error must have occurred in the voltage acquisition unit 101. At this time, the error recording unit 110 records the time, error situation and other information when an error occurs in the actual value of the three-phase voltage collected by the voltage acquisition unit 101. Based on the information of the voltage acquisition unit 101 recorded in the collector information recording unit 111, the after-sales maintenance personnel can be contacted by the after-sales contact unit 112 within the warranty period and the error situation can be sent. In this way, after an error occurs in the voltage acquisition unit 101, the merchant's after-sales or maintenance personnel can be contacted by the after-sales person.

[0073] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A three-phase voltage imbalance compensation control device, comprising a voltage measurement module (1), a control algorithm module (2) and a compensation output module (3), characterized in that: The voltage measurement module (1) is connected to a control algorithm module (2), and the control algorithm module (2) is connected to a compensation output module (3). The voltage measurement module (1) comprises a voltage acquisition unit (101), a periodic self-check setting unit (102), a voltage simulation unit (103), a voltage adjustment unit (104), a feedback unit (105), a collector self-check unit (106), an output unit (107), an error compensation unit (108) and an alarm unit (109). The voltage acquisition unit (101) is respectively connected to the periodic self-check setting unit (102), the voltage simulation unit (103), the voltage adjustment unit (104), the feedback unit (105), the collector self-check unit (106), the output unit (107), the error compensation unit (108) and the alarm unit (109). The voltage simulation unit (103) is connected to a voltage adjustment unit (104), the voltage adjustment unit (104) and the voltage collection unit (101) are connected to a feedback unit (105), and the feedback unit (105) is connected to a collector self-checking unit (106), the collector self-checking unit (106) is respectively connected to an output unit (107), an error compensation unit (108), and an alarm unit (109), the voltage adjustment unit (104) is used to adjust the voltage value generated by the voltage simulation unit (103), and the collector self-checking unit (106) is based on The voltage value generated by the voltage adjustment unit (104) and the voltage value collected and fed back by the voltage collection unit (101) are judged to be consistent. If they are consistent, it means that the voltage collection unit (101) has detected accurately. If they are inconsistent, it means that the voltage collection unit (101) has an error. The output unit (107) is used to output the actual value of the three-phase voltage collected by the voltage collection unit (101) when it is judged that the voltage collection unit (101) has detected accurately. The error compensation unit (108) is used to output the actual value of the three-phase voltage collected by the voltage collection unit (101) when it is judged that the voltage collection unit (101) has an error. When the value is a fixed value, the actual value collected by the voltage collection unit (101) is subtracted from the fixed value error, corrected and outputted; the alarm unit (109) is used to send an alarm to the system background when it is determined that the voltage collection unit (101) has an error and the error value has fluctuations; the control algorithm module (2) comprises a three-phase average value calculation unit (201), a three-phase maximum value calculation unit (202), a three-phase minimum value calculation unit (203) and a compensation parameter calculation unit (204); the compensation parameter calculation unit (204) is used to calculate the compensation ratio and the compensation phase, and the specific formula is as follows: Compensation ratio Compensation Phase in, Represents the inverse tangent function used to calculate the angle value, i.e. the compensation phase , is the minimum value of the three-phase voltage, is the maximum value of the three-phase voltage, is the three-phase average value of voltage.

2. The three-phase voltage unbalance compensation control device according to claim 1, characterized in that: The three-phase average value calculation unit (201) is connected to a three-phase maximum value calculation unit (202), and the three-phase maximum value calculation unit (202) is connected to a three-phase minimum value calculation unit (203), and the three-phase minimum value calculation unit (203) is connected to a compensation parameter calculation unit (204).

3. The three-phase voltage unbalance compensation control device according to claim 1, characterized in that: The voltage acquisition unit (101) acquires actual values ​​of three-phase voltages through a voltage collector, the periodic self-check setting unit (102) is used to set a self-check time interval of the voltage collector, the voltage simulation unit (103) is connected to the voltage acquisition unit (101), and the voltage simulation unit (103) is used to simulate and generate a voltage of a specified value.

4. The three-phase voltage unbalance compensation control device according to claim 1, characterized in that: The three-phase average value calculation unit (201) is used to calculate the three-phase average value of the voltage. The specific formula is as follows: in, is the three-phase voltage value output by the error compensation unit (108) and the output unit (107), is the three-phase average value of voltage.

5. The three-phase voltage unbalance compensation control device according to claim 4, characterized in that: The three-phase maximum value calculation unit (202) is used to calculate the maximum value of the voltage, and the specific formula is as follows: in, is the maximum value of the three-phase voltage; The three-phase minimum value calculation unit (203) is used to calculate the minimum value of the voltage. The specific formula is as follows: in, It is the minimum value of three-phase voltage.

6. The three-phase voltage unbalance compensation control device according to claim 1, characterized in that: The voltage measurement module (1) further comprises an error recording unit (110), a collector information recording unit (111) and an after-sales contact unit (112); the error compensation unit (108) and the alarm unit (109) are connected to the error recording unit (110); the error recording unit (110) is connected to the collector information recording unit (111); and the collector information recording unit (111) is connected to the after-sales contact unit (112).

7. The three-phase voltage unbalance compensation control device according to claim 6, characterized in that: The error recording unit (110) is used to record the time when an error occurs in the actual value of the three-phase voltage collected by the voltage collection unit (101) and information about the error situation; the collector information recording unit (111) is used to store information about the working time, service life, warranty period, and after-sales contact information of the voltage collection unit (101); and the after-sales contact unit (112) is used to contact after-sales maintenance personnel and send the error situation.

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